What types of magnets are there

We know that there are many types of magnets, but what types are there? The editor will briefly tell you here that magnets are generally divided into two categories: permanent magnets and soft magnets. The magnets we call generally refer to permanent magnets.

The permanent magnets are divided into two categories:

The first category is: metal alloy magnets include NdFeB magnets (Nd2Fe14B), samarium cobalt magnets (SmCo), and aluminum nickel cobalt magnets (ALNiCO).

The second category is: ferrite permanent magnet materials (Ferrite).

1. NdFeB magnet: It is the magnet with the highest commercial performance found at present. It is called the magnet king. It has extremely high magnetic performance and its maximum magnetic energy product (BHmax) is 10 times higher than that of ferrite (Ferrite). above. Its own machining performance is also quite good. Operating temperature up to 200 degrees Celsius. Moreover, its texture is hard, its performance is stable, and it has a good price/performance ratio, so it is widely used. However, because of its strong chemical activity, it must be treated with a surface coating. (such as Zn, Ni, electrophoresis, passivation, etc.).

2. Ferrite magnet: its main raw materials include BaFe12O19 and SrFe12O19. Manufactured by the ceramic process method, the texture is relatively hard and it is a brittle material. Because of its good temperature resistance, low price and moderate performance, ferrite magnets have become the most widely used permanent magnets.

3. AlNiCo magnet: It is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. The casting process can be processed into different sizes and shapes, and the machinability is very good. Cast AlNiCo permanent magnets have the lowest reversible temperature coefficient, and the working temperature can be as high as 600 degrees Celsius. AlNiCo permanent magnet products are widely used in various instrumentation and other application fields.

4. Samarium cobalt (SmCo) is divided into SmCo5 and Sm2Co17 according to the different components. Its development is limited due to the high price of its materials. As a rare earth permanent magnet, samarium cobalt (SmCo) not only has a high magnetic energy product (14-28MGOe), reliable coercivity and good temperature characteristics. Compared with NdFeB magnets, samarium cobalt magnets are more suitable for working in high temperature environments.